How to Waterproof a Felt Hat By: Eric Watson Updated On: October 23, 2017 More Articles How to Stiffen Wool Felted Hats How To Do A French Braid How Do I Get Cigarette Smoke Smell Out of Clothes? How to Apply Eyebrow Makeup How to Wear Skinny Jeans About the Author Eric Watson is a professional hatter with a custom hat shop in Cave Creek, Arizona.